| 1 |
Stamens 3 or more per flower. |
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(2) |
| + |
Stamens 2 per flower. |
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(3) |
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| 2 (1) |
Catkins 5-13 cm long, lax, flowers present in whorls. |
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2 S. tetrasperma |
| + |
Catkins 1.5-4-(5) cm long, dense. |
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1 S. acmophylla |
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| 3 (1) |
Dwarf shrubs, prostrate or procumbent, usually less than 30 cm tall. |
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(4) |
| + |
Erect shrubs or trees, more than 30 cm tall. |
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(5) |
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| 4 (3) |
Catkins lateral, terminal on short leafy shoots, slightly loosely flowered, 10-45 mm long; rachis hairy; lamina elliptic, obovate or suborbicular, 7-35 x 5-24 mm. |
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18 S. flabellaris |
| + |
Catkins terminal, only few flowered 7.5-12.7 mm long; rachis glabrous, lamina oblong, obovate lanceolate, 5-21 x 5-8 mm. |
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19 S. lindleyana |
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| 5 (3) |
Filaments glabrous. |
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(6) |
| + |
Filaments hairy at the base. |
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(17) |
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| 6 (5) |
Filaments partly or completely united. |
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(7) |
| + |
Filaments free. |
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(9) |
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| 7 (6) |
Petiole 1-2 mm, lamina 2-3 mm broad. |
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3 S. wilhelmsiana |
| + |
Petiole 2-10 mm, lamina 7 mm or more broad. |
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(8) |
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| 8 (7) |
Twigs dark brown or purplish; adaxial and abaxial leaf surfaces differently coloured. |
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11 S. karelinii |
| + |
Twigs not as above; leaf surfaces not differently coloured. |
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24 S. schugnanica |
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| 9 (6) |
Twigs and leaves silvery or grey tomentose. |
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(10) |
| + |
Twigs glabrous or juvenile branchlets white, pilose; one year old branchlets glabrous; leaves not as above. |
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(14) |
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| 10 (9) |
Lamina about half as broad as long; margin sinuate-erose; filaments >= 7 mm. |
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22 S. aegyptiaca |
| + |
Lamina less than ? as broad as long. |
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(11) |
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| 11 (10) |
Male catkin sessile or subsessile. |
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(12) |
| + |
Male catkin pedunculate. |
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(13) |
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| 12 (11) |
Leaf 15-20 x 0.5-2-(4) cm, lateral veins 25-30 pairs, male catkin 2.5-3 x 1.5 cm. |
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20 S. viminalis |
| + |
Leaf 4.5-14 x 1-2.5 cm, lateral veins 16-18 (-20) pairs; male catkin 2.5-5 x 1-1.5 cm. |
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21 S. turanica |
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| 13 (11) |
Male catkin at anthesis c. (1.5)-2.5-3-(4) x 1-1.5 cm. |
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17 S. wallichiana |
| + |
Male catkin at anthesis c. 1.5-2.5 x 0.8-1-(1.2) cm. |
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24 S. schugnanica |
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| 14 (9) |
Leaf exstipulate, tip obtuse, mucronate. |
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24 S. schugnanica |
| + |
Leaf stipulate, tip acute or acuminate. |
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(15) |
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| 15 (14) |
Leaf tip obliquely acuminate. |
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(16) |
| + |
Leaf tip acute. |
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16 S. dolichostachya |
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| 16 (15) |
Twigs dark brown, purplish, adaxial and abaxial leaf surfaces differently coloured. |
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11 S. karelinii |
| + |
Twigs not as above, adaxial and abaxial leaf surfaces not differently coloured. |
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23 S. fedtschenkoi |
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| 17 (5) |
Filaments free. |
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(18) |
| + |
Filaments partly or completely connate. |
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(27) |
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| 18 (17) |
Lamina elliptic, oblong or obovate, 2.5-6.5 x 1.2-2.4 cm, tip obtuse to acute. |
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9 S. denticulata |
| + |
Lamina not as above. |
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(19) |
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| 19 (18) |
Lamina elliptic to subrhomboidal, narrowed at base, shortly acuminate. |
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15 S. iliensis |
| + |
Lamina not as above. |
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(20) |
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| 20 (19) |
Lamina less than 5 cm long. |
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25 S. sclerophylla |
| + |
Lamina 5 cm or more long. |
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(21) |
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| 21 (20) |
Branches drooping. |
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(22) |
| + |
Branches erect. |
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(23) |
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| 22 (21) |
Male catkin up to 2.5 cm long. |
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13 S. babylonica |
| + |
Male catkin 2.5-5 cm long. |
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12 S. alba |
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| 23 (21) |
Leaf <= 3 cm broad. |
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(24) |
| + |
Leaf >= 3 cm broad. |
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(26) |
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| 24 (23) |
Stipules caducous, small, lanceolate or subulate. |
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(25) |
| + |
Stipules up to 1.3 cm long, semicordate, serrate. |
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16 S. dolichostachya |
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| 25 (24) |
Catkin 4-5 mm broad before emergence of anthers; bracts usually more than 1 mm broad; anthers (0.7-) 0.8-0.9 mm. |
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14 S. excelsa |
| + |
Catkin 3-4 mm broad before emergence of anthers; bracts usually less than 1 mm broad; anther 0.5-0.6 (-0.7) mm. |
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12 S. alba |
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| 26 (23) |
Stipules minute. |
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17 S. wallichiana |
| + |
Stipules up to 1.3 cm. |
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16 S. dolichostachya |
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| 27 (17) |
Branches mostly covered by white bloom. |
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5 S. capusii |
| + |
Branches not covered by white bloom. |
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(28) |
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| 28 (27) |
Catkin 2 cm or less long. |
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(29) |
| + |
Catkin more than 2 cm long. |
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(30) |
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| 29 (28) |
Young branches reddish brown or reddish black; leaves oblong, elliptic or lanceolate, catkin sessile. |
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10 S. caesia |
| + |
Young branches not as above; leaves narrowly lanceolate, peduncle 1-4 mm long. |
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4 S. koeieana |
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| 30 (28) |
Lamina oblong, elliptic or obovate, 2.5-6.5x 1.2-2.4 cm, obtuse or acute. |
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9 S. denticulata |
| + |
Lamina not as above. |
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(31) |
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| 31 (30) |
Filaments partly connate. |
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8 S. sericocarpa |
| + |
Filaments completely connate. |
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(32) |
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| 32 (31) |
Lamina (2.3)-4-10 x 0.5-2.5 cm. |
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6 S. pycnostachya |
| + |
Lamina (1.5)-4-8.5 x 0.3-1 cm. |
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7 S. blakii |
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Note: Salix nuristanica A. K. Skvortsov could not be keyed due to lack of male plants. |
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